Atomic Structure Book Back Questions

7th Standard EM

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Science

Time : 00:45:00 Hrs
Total Marks : 30
    3 x 1 = 3
  1. The basic unit of matter is ________

    (a)

    Element

    (b)

    Atom

    (c)

    Molecule

    (d)

    Electron

  2. _______ is positively charged.

    (a)

    Proton

    (b)

    Electron

    (c)

    Molecule

    (d)

    Neutron

  3. The atomic number of an atom is ________

    (a)

    Number of neutrons

    (b)

    Number of protons

    (c)

    Total number of protons and neutrons

    (d)

    Number of atoms

  4. 3 x 1 = 3
  5. The smaller particles found in the atom is called __________.

    ()

    Sub-atomic particles

  6. The _______ revolve around the nucleus.

    ()

    electrons

  7. There are two electrons in the outermost orbit of the magnesium atom. Hence, the valency of magnesium is___________.

    ()

    2

  8. 4 x 1 = 4
  9. Neutral Particle

  10. (1)

    Proton

  11. Iron

  12. (2)

    Fe

  13. Hydrogen

  14. (3)

    Neutron

  15. Positively charged Particle

  16. (4)

    Monovalent

    3 x 2 = 6
  17. Define an atom.

  18. What is atomic number?

  19. Why neutrons called neutral particles?

  20. 3 x 3 = 9
  21. Distinguish Isotopes from Isobar.

  22. Differentiate mass number from atomic number.

  23. An atom of an element has no electron, will that atom have any mass or not? Can atom exist without electron? If so then give example.

  24. 1 x 5 = 5
  25. Draw the atom structure and explain the position of the sub-atomic particles.

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